Aspose.CAD for .Net是一款专门针对CAD文件操作处理的控件，以前该功能包含在了Aspose.Imaging中，Aspose公司为了更好地完善CAD文件的处理功能，专门把该功能从Aspose.Imaging中剥离出来作为单独的产品，现在开发人员可以利用该控件更好地对CAD文件进行各种操作处理和转换了，下面的代码主要演示了如何快速从CAD文件中进行相关文本的搜索，具体如下：

/ Load an existing DWG file as CadImage.

using (Aspose.CAD.FileFormats.Cad.CadImage cadImage = (Aspose.CAD.FileFormats.Cad.CadImage)Aspose.CAD.Image.Load("sample.dwg"))

{

// search for text in the file 

foreach (Aspose.CAD.FileFormats.Cad.CadObjects.CadBaseEntity entity in cadImage.Entities)

{

    // please, note: we iterate through CadText entities here, but some other entities

    // may contain text also, e.g. CadMText and others

    if (entity.GetType() == typeof(Aspose.CAD.FileFormats.Cad.CadObjects.CadText))

    {

        Aspose.CAD.FileFormats.Cad.CadObjects.CadText text = (Aspose.CAD.FileFormats.Cad.CadObjects.CadText)entity;

        System.Console.WriteLine(text.DefaultValue);

    }

}

 

// search for text on specific layout

// get all layout names and link each layout with corresponding block with entities

Aspose.CAD.FileFormats.Cad.CadLayoutDictionary layouts = cadImage.Layouts;

string[] layoutNames = new string[layouts.Count];

int i = 0;

foreach (Aspose.CAD.FileFormats.Cad.CadObjects.CadLayout layout in layouts.Values)

{

    layoutNames[i++] = layout.LayoutName;

    System.Console.WriteLine("Layout " + layout.LayoutName + " is found");

 

    // find block, applicable for DWG only

    Aspose.CAD.FileFormats.Cad.CadTables.CadBlockTableObject blockTableObjectReference = null;

    foreach (Aspose.CAD.FileFormats.Cad.CadTables.CadBlockTableObject tableObject in cadImage.BlocksTables)

    {

        if (string.Equals(tableObject.HardPointerToLayout, layout.ObjectHandle))

        {

            blockTableObjectReference = tableObject;

            break;

        }

    }

 

    // Collection cadBlockEntity.Entities contains information about all entities on specific layout

    // if this collection has no elements it means layout is a copy of Model layout and contains the same entities

    Aspose.CAD.FileFormats.Cad.CadObjects.CadBlockEntity cadBlockEntity = cadImage.BlockEntities

 

[blockTableObjectReference.BlockName];

}

 

// export to pdf

Aspose.CAD.ImageOptions.CadRasterizationOptions rasterizationOptions = new Aspose.CAD.ImageOptions.CadRasterizationOptions();

rasterizationOptions.PageWidth = 1600;

rasterizationOptions.PageHeight = 1600;

rasterizationOptions.AutomaticLayoutsScaling = true;

rasterizationOptions.CenterDrawing = true;

 

// please, note: if cadBlockEntity collection mentioned above (for dwg) for selected layout or

// entitiesOnLayouts collection by layout's BlockTableRecordHandle (for dxf) is empty

// - export result file will be empty and you should draw Model layout instead

rasterizationOptions.Layouts = new[] { "Layout1" };

 

Aspose.CAD.ImageOptions.PdfOptions pdfOptions = new Aspose.CAD.ImageOptions.PdfOptions();

 

pdfOptions.VectorRasterizationOptions = rasterizationOptions;

cadImage.Save("sample_dwg_out.pdf", pdfOptions);

}